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function f(a, b, c) {
this.a = a;
assertEq(b, 'x');
assertEq(c, void 0);
}
for (var x = 0; x < 9; ++x) {
f.prototype = {};
var obj = new f(x, 'x'); // fewer than f.length arguments
assertEq(obj.a, x);
assertEq(Object.getPrototypeOf(obj), f.prototype);
}